US4947434A - Electronic attenuator - Google Patents
Electronic attenuator Download PDFInfo
- Publication number
- US4947434A US4947434A US07/329,637 US32963789A US4947434A US 4947434 A US4947434 A US 4947434A US 32963789 A US32963789 A US 32963789A US 4947434 A US4947434 A US 4947434A
- Authority
- US
- United States
- Prior art keywords
- noise
- speaker
- microphone
- reversal
- sound
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000005236 sound signal Effects 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 9
- 238000009434 installation Methods 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000010363 phase shift Effects 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 230000001934 delay Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- FCYVWWWTHPPJII-UHFFFAOYSA-N 2-methylidenepropanedinitrile Chemical compound N#CC(=C)C#N FCYVWWWTHPPJII-UHFFFAOYSA-N 0.000 description 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000005404 monopole Effects 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
- B06B1/0688—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction with foil-type piezoelectric elements, e.g. PVDF
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1785—Methods, e.g. algorithms; Devices
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1785—Methods, e.g. algorithms; Devices
- G10K11/17853—Methods, e.g. algorithms; Devices of the filter
- G10K11/17854—Methods, e.g. algorithms; Devices of the filter the filter being an adaptive filter
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1785—Methods, e.g. algorithms; Devices
- G10K11/17857—Geometric disposition, e.g. placement of microphones
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1787—General system configurations
- G10K11/17879—General system configurations using both a reference signal and an error signal
- G10K11/17881—General system configurations using both a reference signal and an error signal the reference signal being an acoustic signal, e.g. recorded with a microphone
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/10—Applications
- G10K2210/104—Aircos
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/30—Means
- G10K2210/301—Computational
- G10K2210/3011—Single acoustic input
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/30—Means
- G10K2210/301—Computational
- G10K2210/3013—Analogue, i.e. using analogue computers or circuits
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/30—Means
- G10K2210/301—Computational
- G10K2210/3031—Hardware, e.g. architecture
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/30—Means
- G10K2210/301—Computational
- G10K2210/3045—Multiple acoustic inputs, single acoustic output
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/30—Means
- G10K2210/321—Physical
- G10K2210/3214—Architectures, e.g. special constructional features or arrangements of features
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/30—Means
- G10K2210/321—Physical
- G10K2210/3229—Transducers
- G10K2210/32291—Plates or thin films, e.g. PVDF
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Mechanical Engineering (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
Description
Claims (3)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63-074195 | 1988-03-28 | ||
JP63074195A JPH01245795A (en) | 1988-03-28 | 1988-03-28 | Electronic silencer |
Publications (1)
Publication Number | Publication Date |
---|---|
US4947434A true US4947434A (en) | 1990-08-07 |
Family
ID=13540156
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US07/329,637 Expired - Lifetime US4947434A (en) | 1988-03-28 | 1989-03-28 | Electronic attenuator |
Country Status (2)
Country | Link |
---|---|
US (1) | US4947434A (en) |
JP (1) | JPH01245795A (en) |
Cited By (55)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5255321A (en) * | 1990-12-05 | 1993-10-19 | Harman International Industries, Inc. | Acoustic transducer for automotive noise cancellation |
US5257316A (en) * | 1990-10-31 | 1993-10-26 | Matsushita Electric Works, Ltd. | Acoustic conductance and silencer utilizing same |
US5293578A (en) * | 1989-07-19 | 1994-03-08 | Fujitso Ten Limited | Noise reducing device |
US5295192A (en) * | 1990-03-23 | 1994-03-15 | Hareo Hamada | Electronic noise attenuation method and apparatus for use in effecting such method |
WO1994008540A1 (en) * | 1992-10-13 | 1994-04-28 | Robert Wagenfeld | Active gas turbine (jet) engine noise suppression |
US5355417A (en) * | 1992-10-21 | 1994-10-11 | The Center For Innovative Technology | Active control of aircraft engine inlet noise using compact sound sources and distributed error sensors |
US5370340A (en) * | 1991-11-04 | 1994-12-06 | General Electric Company | Active control of aircraft engine noise using vibrational inputs |
US5382134A (en) * | 1993-11-01 | 1995-01-17 | General Electric Company | Active noise control using noise source having adaptive resonant frequency tuning through stiffness variation |
US5391053A (en) * | 1993-11-01 | 1995-02-21 | General Electric Company | Active noise control using noise source having adaptive resonant frequency tuning through variable panel loading |
US5402496A (en) * | 1992-07-13 | 1995-03-28 | Minnesota Mining And Manufacturing Company | Auditory prosthesis, noise suppression apparatus and feedback suppression apparatus having focused adaptive filtering |
US5415522A (en) * | 1993-11-01 | 1995-05-16 | General Electric Company | Active noise control using noise source having adaptive resonant frequency tuning through stress variation |
US5420383A (en) * | 1993-10-22 | 1995-05-30 | United Technologies Corporation | Anti-sound arrangement for multi-stage blade cascade |
US5423658A (en) * | 1993-11-01 | 1995-06-13 | General Electric Company | Active noise control using noise source having adaptive resonant frequency tuning through variable ring loading |
US5446790A (en) * | 1989-11-24 | 1995-08-29 | Nippondenso Co., Ltd. | Intake sound control apparatus |
WO1995024171A1 (en) * | 1994-03-07 | 1995-09-14 | Noise Cancellation Technologies, Inc. | Integral device for active control of noise in ducts |
US5457750A (en) * | 1990-12-19 | 1995-10-10 | Gold Star Company, Ltd. | Method and device for reducing noises generated at an indoor unit of a separate type room air conditioner package |
US5458222A (en) * | 1994-12-05 | 1995-10-17 | General Electric Company | Active vibration control of structures undergoing bending vibrations |
US5497043A (en) * | 1992-08-13 | 1996-03-05 | The Secretary Of State For Defence In Her Britannic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland | Vibration reduction |
US5558298A (en) * | 1994-12-05 | 1996-09-24 | General Electric Company | Active noise control of aircraft engine discrete tonal noise |
US5584447A (en) * | 1994-12-19 | 1996-12-17 | General Electric Company | Noise control using a plate radiator and an acoustic resonator |
US5590849A (en) * | 1994-12-19 | 1997-01-07 | General Electric Company | Active noise control using an array of plate radiators and acoustic resonators |
US5618010A (en) * | 1994-12-19 | 1997-04-08 | General Electric Company | Active noise control using a tunable plate radiator |
WO1997017818A1 (en) * | 1995-09-25 | 1997-05-15 | Noise Cancellation Technologies, Inc. | Piezo speaker for improved passenger cabin audio systems |
US5636287A (en) * | 1994-11-30 | 1997-06-03 | Lucent Technologies Inc. | Apparatus and method for the active control of air moving device noise |
US5692053A (en) * | 1992-10-08 | 1997-11-25 | Noise Cancellation Technologies, Inc. | Active acoustic transmission loss box |
US5740258A (en) * | 1995-06-05 | 1998-04-14 | Mcnc | Active noise supressors and methods for use in the ear canal |
US5778081A (en) * | 1996-03-04 | 1998-07-07 | United Technologies Corp | Active noise control using phased-array active resonators |
US5812684A (en) * | 1995-07-05 | 1998-09-22 | Ford Global Technologies, Inc. | Passenger compartment noise attenuation apparatus for use in a motor vehicle |
US5828760A (en) * | 1996-06-26 | 1998-10-27 | United Technologies Corporation | Non-linear reduced-phase filters for active noise control |
EP0886262A2 (en) * | 1997-06-19 | 1998-12-23 | DORNIER GmbH | Method for reducing noise in pipes carrying sound-conducting media |
US6084971A (en) * | 1997-06-10 | 2000-07-04 | Siemens Electric Limited | Active noise attenuation system |
US20010036279A1 (en) * | 2000-05-08 | 2001-11-01 | Daly Paul D. | Active noise cancellation system |
US20010036282A1 (en) * | 2000-05-12 | 2001-11-01 | Roy Haworth | Active noise attenuation inlet microphone system |
US20010046302A1 (en) * | 2000-04-14 | 2001-11-29 | Daly Paul D. | Active noise cancellation optimized air gaps |
US20020039422A1 (en) * | 2000-09-20 | 2002-04-04 | Daly Paul D. | Driving mode for active noise cancellation |
US20020150259A1 (en) * | 2000-06-06 | 2002-10-17 | Mclean Ian R. | Integrated and active noise control inlet |
US20030059058A1 (en) * | 2001-09-25 | 2003-03-27 | Brian Chiara | Modular active noise air filter speaker and microphone assembly |
US6557665B2 (en) | 2000-06-06 | 2003-05-06 | Siemens Canada Limited | Active dipole inlet using drone cone speaker driver |
US20030112981A1 (en) * | 2001-12-17 | 2003-06-19 | Siemens Vdo Automotive, Inc. | Active noise control with on-line-filtered C modeling |
US20030152239A1 (en) * | 2002-01-17 | 2003-08-14 | Filterwerk Mann & Hummel Gmbh | Resonator |
US6648750B1 (en) * | 1999-09-03 | 2003-11-18 | Titon Hardware Limited | Ventilation assemblies |
US6658118B1 (en) * | 1998-06-05 | 2003-12-02 | Dana Corporation | Suppression of fluid-borne noise |
US6684977B2 (en) | 2001-09-13 | 2004-02-03 | Siemens Vdo Automotive, Inc. | Speaker retention assembly for an active noise control system |
US6702061B2 (en) | 2001-03-15 | 2004-03-09 | Siemens Vdo Automotive, Inc. | Environmentally protected microphone for an active noise control system |
US6775384B2 (en) | 2000-09-20 | 2004-08-10 | Siemens Vdo Automotive Inc. | Environmentally robust noise attenuation system |
US6898289B2 (en) | 2000-09-20 | 2005-05-24 | Siemens Vdo Automotive Inc. | Integrated active noise attenuation system and fluid reservoir |
EP1796077A2 (en) * | 2005-12-07 | 2007-06-13 | Delphi Technologies, Inc. | Excitation of air directing valves and air handling surfaces in the cancellation of air handling system noise |
DE102006039199B3 (en) * | 2006-08-22 | 2007-11-29 | Eads Deutschland Gmbh | Active noise reduction system for use in e.g. aircraft air conditioning channel, has diaphragm body deformable periodically by piezo unit, where diaphragm body is arranged in flow channel and is surrounded by fluid on both sides |
US20080187147A1 (en) * | 2007-02-05 | 2008-08-07 | Berner Miranda S | Noise reduction systems and methods |
US20100310083A1 (en) * | 2009-06-09 | 2010-12-09 | Rohde & Schwarz Gmbh & Co. Kg | Electronic device with noise-suppression system |
US20120210741A1 (en) * | 2009-11-02 | 2012-08-23 | Mitsubishi Electric Corporation | Noise control system, and fan structure and outdoor unit of air-conditioning-apparatus each equipped therewith |
WO2012171533A2 (en) | 2011-06-15 | 2012-12-20 | Aalborg Universitet | System and method for attenuating noise from a fluid machine or a turbulent noise source |
US20160084268A1 (en) * | 2014-09-22 | 2016-03-24 | Regal Beloit America, Inc. | System and methods for reducing noise in an air moving system |
US20220223136A1 (en) * | 2019-05-20 | 2022-07-14 | Nitto Denko Corporation | Active noise control system |
US20240027924A1 (en) * | 2021-03-04 | 2024-01-25 | Changxin Memory Technologies, Inc. | Vibration attenuation structure and exposure device |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2534543Y2 (en) * | 1991-04-11 | 1997-04-30 | 三菱電機株式会社 | Electronic silencing system |
US5828768A (en) * | 1994-05-11 | 1998-10-27 | Noise Cancellation Technologies, Inc. | Multimedia personal computer with active noise reduction and piezo speakers |
CN1655645A (en) | 1995-09-02 | 2005-08-17 | 新型转换器有限公司 | Loudspeaker and apparatus using loudspeaker |
KR20030023062A (en) * | 2001-09-11 | 2003-03-19 | 주식회사 엘지이아이 | Outdoor-unit of airconditioner with speaker |
KR20030023047A (en) * | 2001-09-11 | 2003-03-19 | 주식회사 엘지이아이 | Airconditioner with speaker |
KR20030023042A (en) * | 2001-09-11 | 2003-03-19 | 주식회사 엘지이아이 | Airconditioner with speaker |
KR100768523B1 (en) * | 2005-03-09 | 2007-10-18 | 주식회사 휴먼터치소프트 | The Active Noise Control Method and Device using the Film Speakers |
JP6368106B2 (en) * | 2014-02-20 | 2018-08-01 | 株式会社日立製作所 | Elevator device and noise reduction method |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5794799A (en) * | 1980-12-05 | 1982-06-12 | Jinichi Nishiwaki | Silencer for low-frequency noise |
US4367426A (en) * | 1980-03-19 | 1983-01-04 | Hitachi, Ltd. | Ceramic transparent piezoelectric transducer |
JPS61109495A (en) * | 1984-10-30 | 1986-05-27 | Japan Synthetic Rubber Co Ltd | Silence controlling method of low frequency sound |
JPS61296392A (en) * | 1985-06-26 | 1986-12-27 | 日立プラント建設株式会社 | Electronic silencing system |
US4665549A (en) * | 1985-12-18 | 1987-05-12 | Nelson Industries Inc. | Hybrid active silencer |
US4807294A (en) * | 1986-06-20 | 1989-02-21 | Mitubishi Petrochemical Co., Ltd. | Piezoelectric and foam resin sheet speaker |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61192339A (en) * | 1985-02-21 | 1986-08-26 | Agency Of Ind Science & Technol | Photochemical reaction apparatus |
-
1988
- 1988-03-28 JP JP63074195A patent/JPH01245795A/en active Pending
-
1989
- 1989-03-28 US US07/329,637 patent/US4947434A/en not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4367426A (en) * | 1980-03-19 | 1983-01-04 | Hitachi, Ltd. | Ceramic transparent piezoelectric transducer |
JPS5794799A (en) * | 1980-12-05 | 1982-06-12 | Jinichi Nishiwaki | Silencer for low-frequency noise |
JPS61109495A (en) * | 1984-10-30 | 1986-05-27 | Japan Synthetic Rubber Co Ltd | Silence controlling method of low frequency sound |
JPS61296392A (en) * | 1985-06-26 | 1986-12-27 | 日立プラント建設株式会社 | Electronic silencing system |
US4665549A (en) * | 1985-12-18 | 1987-05-12 | Nelson Industries Inc. | Hybrid active silencer |
US4807294A (en) * | 1986-06-20 | 1989-02-21 | Mitubishi Petrochemical Co., Ltd. | Piezoelectric and foam resin sheet speaker |
Cited By (68)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5293578A (en) * | 1989-07-19 | 1994-03-08 | Fujitso Ten Limited | Noise reducing device |
US5446790A (en) * | 1989-11-24 | 1995-08-29 | Nippondenso Co., Ltd. | Intake sound control apparatus |
US5295192A (en) * | 1990-03-23 | 1994-03-15 | Hareo Hamada | Electronic noise attenuation method and apparatus for use in effecting such method |
US5257316A (en) * | 1990-10-31 | 1993-10-26 | Matsushita Electric Works, Ltd. | Acoustic conductance and silencer utilizing same |
US5255321A (en) * | 1990-12-05 | 1993-10-19 | Harman International Industries, Inc. | Acoustic transducer for automotive noise cancellation |
US5457750A (en) * | 1990-12-19 | 1995-10-10 | Gold Star Company, Ltd. | Method and device for reducing noises generated at an indoor unit of a separate type room air conditioner package |
US5370340A (en) * | 1991-11-04 | 1994-12-06 | General Electric Company | Active control of aircraft engine noise using vibrational inputs |
US5402496A (en) * | 1992-07-13 | 1995-03-28 | Minnesota Mining And Manufacturing Company | Auditory prosthesis, noise suppression apparatus and feedback suppression apparatus having focused adaptive filtering |
US5497043A (en) * | 1992-08-13 | 1996-03-05 | The Secretary Of State For Defence In Her Britannic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland | Vibration reduction |
US5692053A (en) * | 1992-10-08 | 1997-11-25 | Noise Cancellation Technologies, Inc. | Active acoustic transmission loss box |
US5386689A (en) * | 1992-10-13 | 1995-02-07 | Noises Off, Inc. | Active gas turbine (jet) engine noise suppression |
WO1994008540A1 (en) * | 1992-10-13 | 1994-04-28 | Robert Wagenfeld | Active gas turbine (jet) engine noise suppression |
US5355417A (en) * | 1992-10-21 | 1994-10-11 | The Center For Innovative Technology | Active control of aircraft engine inlet noise using compact sound sources and distributed error sensors |
US5420383A (en) * | 1993-10-22 | 1995-05-30 | United Technologies Corporation | Anti-sound arrangement for multi-stage blade cascade |
US5415522A (en) * | 1993-11-01 | 1995-05-16 | General Electric Company | Active noise control using noise source having adaptive resonant frequency tuning through stress variation |
US5423658A (en) * | 1993-11-01 | 1995-06-13 | General Electric Company | Active noise control using noise source having adaptive resonant frequency tuning through variable ring loading |
US5391053A (en) * | 1993-11-01 | 1995-02-21 | General Electric Company | Active noise control using noise source having adaptive resonant frequency tuning through variable panel loading |
US5382134A (en) * | 1993-11-01 | 1995-01-17 | General Electric Company | Active noise control using noise source having adaptive resonant frequency tuning through stiffness variation |
WO1995024171A1 (en) * | 1994-03-07 | 1995-09-14 | Noise Cancellation Technologies, Inc. | Integral device for active control of noise in ducts |
US5636287A (en) * | 1994-11-30 | 1997-06-03 | Lucent Technologies Inc. | Apparatus and method for the active control of air moving device noise |
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